Hello, thank you for getting back to me.
I was able to import the slide.

First I tried increasing the memory on the wp-config.php with no success.
Then I tried importing the zip file and got the following message: “The PHP ZipArchive extension is required to import .zip files.”.
So I imported the json file from the layerslider settings page and then added the images manually. The slide is working now.

Hi,
Thank you for sharing your solution, please ask your webhost to install PHP ZipArchive extension for you so you won’t have issues with other elements in the future, such as importing the icon packs.
Shall we close this then?